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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Highly dispersed manganese oxide catalysts grafted on SBA-15: Synthesis, characterization and catalytic application in trans-stilbene epoxidation
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Highly dispersed manganese oxide catalysts grafted on SBA-15: Synthesis, characterization and catalytic application in trans-stilbene epoxidation

机译：SBA-15上接枝的高分散锰氧化物催化剂：反式二苯乙烯环氧化的合成，表征及催化应用

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摘要

Manganese oxide catalysts supported on mesoporous silica SBA-15 (Mn-SBA-15) were synthesized following a controlled post-synthesis grafting process through the atomic layer deposition. N2-physisorp-tion, X-ray diffraction, transmission electron microscopy, Raman spectroscopy, H2 temperature-programmed reduction, diffuse reflectance UV-Vis, and X-ray absorption near-edge structure were employed to characterize the physicochemical properties. This grafting method can efficiently upload a large amount of Mn species, and the Mn-SBA-15 samples exhibited high surface area, large pore volume, and uniform pore size. The spectroscopic results revealed that the manganese oxides with the coexistence of Mn~(2+) and Mn~(3+) either highly dispersed on the mesoporous silica surface or formed small size MnO_x clusters in the SBA-15 channels depending on the manganese oxide contents. These manganese catalysts with ordered pore structure exhibited superior activity and selectivity towards desired product in the liquid-phase epoxidation of trans-stilbene using tert-butyl hydroperoxide as the oxidant.
机译：在受控的合成后接枝过程中，通过原子层沉积法合成了负载在介孔二氧化硅SBA-15（Mn-SBA-15）上的锰氧化物催化剂。 N2物理吸附，X射线衍射，透射电子显微镜，拉曼光谱，H2程序升温还原，漫​​反射UV-Vis和X射线吸收近边缘结构被用来表征理化性质。这种接枝方法可以有效地上传大量的Mn，并且Mn-SBA-15样品具有高表面积，大孔体积和均匀的孔径。光谱结果表明，锰氧化物（Mn〜（2+）和Mn〜（3+）共存）要么高度分散在介孔二氧化硅表面上，要么在SBA-15通道中形成小尺寸的MnO_x簇，具体取决于锰氧化物内容。这些具有规则孔结构的锰催化剂在使用叔丁基过氧化氢作为氧化剂的反式二苯乙烯液相环氧化中表现出优异的活性和对所需产物的选择性。

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